diff --git a/srcpkgs/singular/patches/upstream_omalloc_new_musl.patch b/srcpkgs/singular/patches/upstream_omalloc_new_musl.patch
new file mode 100644
index 0000000000..354603bb2c
--- /dev/null
+++ b/srcpkgs/singular/patches/upstream_omalloc_new_musl.patch
@@ -0,0 +1,40 @@
+From e1643135645a3cc97af8659018defd2b8617bb4e Mon Sep 17 00:00:00 2001
+From: Hans Schoenemann <hannes@mathematik.uni-kl.de>
+Date: Thu, 23 Sep 2021 10:57:25 +0200
+Subject: [PATCH] omalloc: fix alignment stuff for "make check"
+
+---
+ omalloc/omtTest.c | 6 ------
+ omalloc/omtTest.h | 2 +-
+ 2 files changed, 1 insertion(+), 7 deletions(-)
+
+diff --git a/omalloc/omtTest.c b/omalloc/omtTest.c
+index 715fbb113c..75c8cdb210 100644
+--- a/omalloc/omtTest.c
++++ b/omalloc/omtTest.c
+@@ -70,12 +70,6 @@ void omtTestDebug(omMemCell cell)
+   }
+ 
+   is_size = omSizeOfAddr(cell->addr);
+-  if (!OM_IS_ALIGNED(is_size))
+-  {
+-    omReportError(omError_Unknown, omError_NoError, OM_FLR,
+-                  "is_size == %u is unaligned", is_size);
+-    return;
+-  }
+   if (is_size < size)
+   {
+     omReportError(omError_Unknown, omError_NoError, OM_FLR,
+diff --git a/omalloc/omtTest.h b/omalloc/omtTest.h
+index a579d88011..6faa099c89 100644
+--- a/omalloc/omtTest.h
++++ b/omalloc/omtTest.h
+@@ -48,7 +48,7 @@ void TestFree(omMemCell cell);
+ 
+ #define IS_STICKY_BIN(spec) (spec & 1)
+ // #define IS_STICKY_BIN(spec) (0)
+-#define GET_SIZE(spec)      (spec & ((((unsigned long) 1) << 14) -1))
++#define GET_SIZE(spec)      OM_ALIGN_SIZE((spec & ((((unsigned long) 1) << 14) -1)))
+ #define SET_SIZE(spec, size) spec = ((spec & ~((((unsigned long) 1) << 14) -1)) | (size))
+ #define IS_ALIGNED(spec)    (spec & (((unsigned long) 1) << 15))
+ #define IS_ZERO(spec)       (spec & (((unsigned long) 1) << 16))
diff --git a/srcpkgs/singular/patches/upstream_polys_test_musl.patch b/srcpkgs/singular/patches/upstream_polys_test_musl.patch
new file mode 100644
index 0000000000..73ee062e2f
--- /dev/null
+++ b/srcpkgs/singular/patches/upstream_polys_test_musl.patch
@@ -0,0 +1,22 @@
+From 6e2383111a18b2fa2d3421045625d1d424eb1e25 Mon Sep 17 00:00:00 2001
+From: Hans Schoenemann <hannes@mathematik.uni-kl.de>
+Date: Mon, 20 Sep 2021 15:13:36 +0200
+Subject: [PATCH] fix: make check: polys_test
+
+---
+ libpolys/tests/polys_test.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libpolys/tests/polys_test.h b/libpolys/tests/polys_test.h
+index 5526aa5a6b..5b4c561238 100644
+--- a/libpolys/tests/polys_test.h
++++ b/libpolys/tests/polys_test.h
+@@ -2481,7 +2481,7 @@ class PolysTestSuite : public CxxTest::TestSuite
+     {
+       for (int qi = 0; qi <= 100; qi++)
+       {
+-        int c = rand() % 1000000;
++        int c = rand() % 1000000+1; /* c must not be 0 */
+         poly qterm = p_ISet(c, r); p_SetExp(qterm, 1, qi, r);
+         p_Setm(qterm, r);
+         number qtermAsN = toFractionNumber(qterm, cf);
diff --git a/srcpkgs/singular/template b/srcpkgs/singular/template
new file mode 100644
index 0000000000..d3af1c8b91
--- /dev/null
+++ b/srcpkgs/singular/template
@@ -0,0 +1,26 @@
+# Template file for 'singular'
+pkgname=singular
+version=4.2.1
+revision=1
+build_style=gnu-configure
+configure_args="--with-readline=ncurses
+	--enable-gfanlib
+	--enable-Singular
+	--enable-factory
+	--disable-doc
+	--disable-polymake
+	--without-python
+	--with-libparse
+	ac_cv_lib_cddgmp_dd_free_global_constants=yes"
+hostmakedepends="perl tar doxygen"
+makedepends="flintlib-devel cddlib-devel readline-devel graphviz"
+short_desc="Computer algebra system for polynomial computations"
+maintainer="dkwo <nicolopiazzalunga@gmail.com>"
+license="GPL-2.0-or-later"
+homepage="https://www.singular.uni-kl.de"
+distfiles="https://service.mathematik.uni-kl.de/ftp/pub/Math/Singular/src/${version//./-}/singular-${version}.tar.gz"
+checksum=28a56df84f85b116e0068ffecf92fbe08fc27bd4c5ba902997f1a367db0bfe8d
+
+if [ -z "$CROSS_BUILD" ]; then
+	makedepends+=" ntl-devel"
+fi